How to Accurately Calculate the Expected Date of Delivery?

The estimated due date can be calculated by adding approximately 280 days to the first day of the last menstrual period. This method is more accurate for women with a menstrual cycle of 28-30 days and regular menstruation. The estimated due date is actually a summary of human experience for the majority of people who conceive naturally. If the menstrual cycle is 28-30 days, the estimated due date is 280 days from the first day of the last menstrual period. If it is calculated based on the actual time of conception, it is 266 days. Currently, the most accurate way to determine the estimated due date is through reproductive assistance technology. We can know when the blastocyst was implanted and how many days old it is. For people who conceive naturally, it is indeed impossible to determine the exact day of conception. Therefore, the estimation is a process of statistical calculation based on data. For example, subtracting three months and adding seven days, or adding three months and adding seven days. It should be noted that the estimated due date does not necessarily mean that the baby will be born on that day, but it is only an approximate calculation of the 40 weeks of pregnancy.